No, not the politics of envy - the politics of fairness.
Many others have worked equally hard, done without luxuries such as holidays, cars and latest electronic gadgets, but don't live in the SE, where (as others have agreed) much of the money passed down to the next generation comes from unearned income in house price inflation.
Children who inherit that unearned wealth simply compound the geographical unfairness and will pass it to the next generations in perpetuity. It's not about envy - it's about justice. It is easy to get trapped in an area where house prices are low, as geographical mobility and therefore opportunities for work are limited. The utterly tone-deaf advice that people should 'get on their bikes' is idiotic when many years of paying into a mortgage in one area wouldn't buy a shed in another. There is also the unfairness of having people retiring to cheaper areas having inherited money or having sold a small house whether as BTL or to live mortgage-free, which pushes up prices for locals. I've heard it called FILTH - Failed In London, Try Hastings. I wouldn't use that sort of language personally, but I understand the resentment.
Why do people think there are so many disaffected people in the UK? On one hand there are those with unearned wealth of hundreds of thousands, those who have had the opportunity to earn hundreds of thousands, those with large pensions and maxed out ISAs and full holdings in Premium Bonds, and on the other there are those who use food banks, have to declare birthday presents to have them deducted from Universal Credit, have to work for minimum wage and hand much of it over to landlords and scrape by on what's left. The second group suffers from worse health and lower life-expectancy than the first, too, and when they die there is much less to pass down to their children. If care is needed, a £100k cap will eat up most of the value of a £120k house, but just scrape a bit off the top of the value of one worth £1m.
This is not about working hard - it's about life chances.
We have seen how easy it is for social cohesion to break down. If we want to live in a country that is ruled by consent and have streets that are safe to walk on we have to do something about the unfairness, and IHT is one way to stop it being so ingrained. Those who have had the good fortune to accumulate wealth (via savings, hard work or inheritance) can still pass some of it on - it is a basic human instinct to want to help the next generation - but after a point at least some of it should go back to the public purse.